C2A gear box reducer DIY science & technology small production car motor dual drive assembly toy for Office teaching 1:20 - купить

Купить C2A gear box reducer DIY science & technology small production car motor dual drive assembly toy for Office teaching 1:20 |

 The reduction ratio:1:20 

 the shaft diameter :2 mm

 motor voltage 3v and 6v are available

motor speed:  when 3V,the reduction is  14500 revolutions, it will be 725 RPM after slow down

The big gear diameter: 26 mm

diameter of axle :2mm

Black box size: 6 cm ;body  width: 9 cm (including gear set width)